Welding Cast Iron

Yes, for some applications. Need to be more specific about the parts. Thickness, form, application. Depending on that, the Cast iron might need preheating. To avoid slack inclusion, you might be better off with Mig under Argon (or mix) for heavier applications.

dvmdsc is right. Some applications, sometimes. Depends on the iron composition. Adding Ni will help, or using Ni wire.

This takes a lot of trial and error.

Good metal composition, but a small regular schedule pipe I would not recommend to do with it. However for heavy weld a good choice.

I can see someone has welded cast before. I have used a special Ni alloy containing some Aluminum with great results. What are your thoughts on a quick peen prior to slow cooling?

That may come up with some good results before slow cooling but I never tried that. Normally slow cooling of weldable cast iron would lead to good results as per my experience.

Regards,

Ashfaq Anwer

http://thepetrostreet.com

One for the economical and easy way of welding CI to MS is use of E 7018 or E 7016 type of electrodes for both butt and fillet joints. If required the CI part to be heated to 350 to 400 ⁰ C. you can get a matching colour. and the joint finish by grinding.

Another easiest way is to use E 309 or E 304 type SS electrodes. With its 45% elongation this electrode selection helps to avoid any type cracks likely to occur with CS electrodes at times. Pre heating to 100⁰C or so used to avoid grease, oil stains on CI. Only limitation is color variation compared to base metal color.

The third way is to use ferro-nickel electrode with 45% Fe+ 55% Ni or 98Ni+2%Fe Withe High nickel electrodes you can limit pre heat to remove impurities on CI.

In both above cases the weld is machinable.using HS tool

Sridhar.

This is more of an art than a science.There are so many varieties, including cast steel, etc.

PEbob

Yes Cast Iron and Carbon steel can be welded together.

You would like to consider the end requirement to decide whether you want to use MMAW or TIG welding.

The electrode / filler wire should certainly have a good Ni content eg Oerlikon Fon E117 / E115 /E501 ; Eutectic 2200 / 6800 etc (pls check for the corect name/ numbers as my infrmation is a bit old) and many varieties offered by Magna.

Besides selecting the welding alloy, procedure also needs to be carefully established for welding CI to CS.

First of all check the hardness of the CI , if possible by lightly hammering a punch or light filing on any of its possbile corner.

As you know CI is porous by nature , the next check therefore is to see if it is soaked by Oil /Grease etc. .

As such apart from the welding alloy, procedures to remove oil/grease/impurities , temperature control and sequence of welding are the essentials to weld CI successfully.

Also due to its porous nature CI is not a good conductor of heat.

There fore depending upon the Thickness a proper Preheating and Interpass temperature has to be maintained. Carrying out sequential welding is essential too.

Please do keep in mind that some CI (having high hardness) are not at all weldable !

For information , the welding alloy maufacturers mentioned above usually do advice on the right welding alloy and the procedure to be used. You may contact any of those near to you for further detailing.

Wish you all the best

dear friend u can weld cast iron to cast steel and the electrode can use E-7016 and E-Ni Ci depending on work requirements

Hey, it is possible to weld Cast Iron to Carbon Steel.

However, there are some factors to consider:

1. The stress going to be applied on the joint. The two materials are of different type and so the joint strength will be compromised.

2. The welding rod should be stainless steel rods.

3. The workmanship. If the person going to weld is highly skilled, you will certainly get a good joint as a result.

4. And of course like the other colleagues suggested, preheating is recommended.

Now, you can also consider other options like bolting the two surfaces.